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Localization of Radiolabeled Somatostatin Analogs in the Spleen. 2016

Marleen Melis, and Daniel Kaemmerer, and Jan de Swart, and Harshad R Kulkarni, and Amelie Lupp, and Jörg Sänger, and Harald C Groen, and Mark W Konijnenberg, and Marion de Jong, and Richard P Baum
From the *Department of Nuclear Medicine, Erasmus MC, Rotterdam, the Netherlands; †Department of General and Visceral Surgery, and ‡Theranostics Center for Molecular Radiotherapy and Molecular Imaging, Zentralklinik Bad Berka, Bad Berka; §Institute of Pharmacology and Toxicology, Jena University Hospital, Jena; ∥Laboratory of Pathology and Cytology, Zentralklinik Bad Berka, Bad Berka, Germany; and ¶Department of Radiology, Erasmus MC, Rotterdam, the Netherlands.

Radiolabeled somatostatin (SST) analogs, used to visualize and treat SST receptor (SSTR)-expressing neuroendocrine tumors, also accumulate in the spleen. There is a high interpatient variation and no significant radiation-induced splenic toxicity; however, an absorbed dose-related reduction in spleen size was detected. However, the exact localization of radioactivity and the role of SST receptors in splenic retention are unknown. Therefore, we performed ex vivo micro-SPECT of the isolated spleen from a patient with a pancreatic neoplasm after 1 GBq (27 mCi) Lu-DOTATATE administration, followed by autoradiography and immunohistochemistry. Ex vivo autoradiography demonstrated convincingly that most radioactivity accumulated in red pulp.

UI MeSH Term Description Entries
D009942 Organometallic Compounds A class of compounds of the type R-M, where a C atom is joined directly to any other element except H, C, N, O, F, Cl, Br, I, or At. (Grant & Hackh's Chemical Dictionary, 5th ed) Metallo-Organic Compound,Metallo-Organic Compounds,Metalloorganic Compound,Organometallic Compound,Metalloorganic Compounds,Compound, Metallo-Organic,Compound, Metalloorganic,Compound, Organometallic,Compounds, Metallo-Organic,Compounds, Metalloorganic,Compounds, Organometallic,Metallo Organic Compound,Metallo Organic Compounds
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D013154 Spleen An encapsulated lymphatic organ through which venous blood filters.
D015282 Octreotide A potent, long-acting synthetic SOMATOSTATIN octapeptide analog that inhibits secretion of GROWTH HORMONE and is used to treat hormone-secreting tumors; DIABETES MELLITUS; HYPOTENSION, ORTHOSTATIC; HYPERINSULINISM; hypergastrinemia; and small bowel fistula. Octreotide Acetate,Compound 201-995,Octreotide Acetate Salt,SAN 201-995,SM 201-995,SMS 201-995,Sandostatin,Sandostatine,Sandoz 201-995,Compound 201 995,Compound 201995,SAN 201 995,SAN 201995,SM 201 995,SM 201995,SMS 201 995,SMS 201995,Sandoz 201 995,Sandoz 201995
D015899 Tomography, Emission-Computed, Single-Photon A method of computed tomography that uses radionuclides which emit a single photon of a given energy. The camera is rotated 180 or 360 degrees around the patient to capture images at multiple positions along the arc. The computer is then used to reconstruct the transaxial, sagittal, and coronal images from the 3-dimensional distribution of radionuclides in the organ. The advantages of SPECT are that it can be used to observe biochemical and physiological processes as well as size and volume of the organ. The disadvantage is that, unlike positron-emission tomography where the positron-electron annihilation results in the emission of 2 photons at 180 degrees from each other, SPECT requires physical collimation to line up the photons, which results in the loss of many available photons and hence degrades the image. CAT Scan, Single-Photon Emission,CT Scan, Single-Photon Emission,Radionuclide Tomography, Single-Photon Emission-Computed,SPECT,Single-Photon Emission-Computed Tomography,Tomography, Single-Photon, Emission-Computed,Single-Photon Emission CT Scan,Single-Photon Emission Computer-Assisted Tomography,Single-Photon Emission Computerized Tomography,CAT Scan, Single Photon Emission,CT Scan, Single Photon Emission,Emission-Computed Tomography, Single-Photon,Radionuclide Tomography, Single Photon Emission Computed,Single Photon Emission CT Scan,Single Photon Emission Computed Tomography,Single Photon Emission Computer Assisted Tomography,Single Photon Emission Computerized Tomography,Tomography, Single-Photon Emission-Computed
D019275 Radiopharmaceuticals Compounds that are used in medicine as sources of radiation for radiotherapy and for diagnostic purposes. They have numerous uses in research and industry. (Martindale, The Extra Pharmacopoeia, 30th ed, p1161) Radiopharmaceutical

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